Tool to verify null check (FindBugs, CheckStyle ..)

[Swerrgy Smith]

Dear all,

I often forget to check if an object is null before using it.
Do you know any tool (like FindBugs, CheckStyle ...) that can detect whether an object is checked before it is used and give alarm to programmer?

Thank you very much.

[Siddhesh Deodhar]

I use FindBugs. It shows me all the places where exception can come in future.

example. suppose i have a method

   
public boolean compareValue(String cmpStr)
{
    if(cmpStr.equals("yes")
        return true;
    else
       return false;
}
 

On this if i run findbug, it warns me at line if(cmpStr.equals("yes").
It says dont do cmpStr.equals("yes") do "yes".equals(cmpStr)

[Swerrgy Smith]

Siddhesh Deodhar wrote:I use FindBugs. It shows me all the places where exception can come in future.

example. suppose i have a method

   
public boolean compareValue(String cmpStr)
{
    if(cmpStr.equals("yes")
        return true;
    else
       return false;
}
 

On this if i run findbug, it warns me at line if(cmpStr.equals("yes").
It says dont do cmpStr.equals("yes") do "yes".equals(cmpStr)

Thank you very much

[Kj Reddy]

I too use FindBugs, its quite useful.

[Swerrgy Smith]

I have just checked with FindBugs. It can only find simple null check. However, if we wrote something like following code:

   
if (myList.size() > 0) {
    //do something
}
 

instead of

   
if (myList != null && myList.size() > 0) {
    //do something
}
 

In this case, FindBugs will not detect what we have forgotten.
Which tool can be used for this purpose?